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Interim Consolidated Statements of Shareholders' Equity and Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2015 $ 580,457 $ 448 $ 697,570 $ (2,543,229) $ 2,692,317 $ (266,649)
Beginning balance, shares at Dec. 31, 2015   27,090,118        
Stock Issued During Period, Value, Treasury Stock Reissued 25,471     36,450 10,979  
Exercise of stock options and restricted stock units, shares   278,623        
Repurchases of common stock (499,992)     (499,992)    
Repurchases of common stock, shares   (1,348,507)        
Tax benefit resulting from exercise of certain employee stock options 17,680   17,680      
Adjustment to Additional Paid in Capital, Share-Based Compensation 15,306   15,306      
Net earnings 384,370       384,370  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (88,349)         (88,349)
Ending balance at Dec. 31, 2016 $ 434,943 $ 448 730,556 (3,006,771) 3,065,708 (354,998)
Ending balance, shares at Dec. 31, 2016 26,020,234 26,020,234        
Stock Issued During Period, Value, Treasury Stock Reissued $ 23,315     29,243 5,928  
Exercise of stock options and restricted stock units, shares 206,646 206,646        
Repurchases of common stock $ (334,998)     (334,998)    
Repurchases of common stock, shares (647,756) (647,756)        
Adjustment to Additional Paid in Capital, Share-Based Compensation $ 11,823   11,823      
Net earnings 298,996       298,996  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 77,361         77,361
Ending balance at Sep. 30, 2017 $ 512,979 $ 448 $ 742,379 $ (3,312,526) 3,360,315 $ (277,637)
Ending balance, shares at Sep. 30, 2017 25,579,124 25,579,124        
Cumulative Effect of New Accounting Principle in Period of Adoption $ 1,539       $ 1,539